Woodworking-tool.



PATENTED AUG. 1a, 1903. J. J. BLANDFORD & J. MAJGREGOR.

WOODWOBKING TOOL.

APPLIOATION FILED DBO. 20. 1902.

N0 MODEL.

.21 i 2 f c fi J- W I 2mm 6-,! M W SMW/WMS- UNITED STATES Patented August 18,1903.

JOSEPH JORGENSEN BLANDFORD, OF ELIZABETH, AND JOHN MAOGREGOR, OF NEWARK, NElV JERSEY; SAID BLANDFORD ASSIGNOR OF FIFTEEN ONE-HUNDREDTHS OF HIS RIGHT TO ROBERT J. MONTGOMERY, OF

ELIZABETH, NElV JERSEY.

WOODWORKlNG-TOOL.

SPEGIFICATION forming part of Letters Patent No. 736,57 5, dated August 18, 1903.

Application filed December 20,1902. Serial No. 135,965. (No model.)

To all whom it may concern:

Be it known that we, JOSEPH JoRcENsEN BLANDFORD, residing at Elizabeth, Union county, and JOHN llIACGREGOR, residing at Newark, Essex county, New Jersey, citizens of the United States, have invented an 1111- proved VVoodworking-Tool, of which the following is a specification.

The tool forming the subject-matter of this invention is a bit for cutting circular apertures in wood, and is specially designed for,

and adapted to the making of templets used, for instance, in iron and steel construction of ships, buildings, bridges, Jae. It has a I 5 shank or spindle of usual character and a cutting-head comprising a center piece or point of other than circular cross-section, preferably triangular or square, and a cutter whose cutting edge describes when the bit is rotated a circular line around the axis of the center point and whose outer face is a uniform radial distance from the axis of the center point, the inner face being inclined to the cutting edge to afford the proper stock or thickness of metal. \Vith such a bit or tool a true clean-cut circular aperture may be formed all parts of the walls of which are parallel with its axis, compression of the wood due to entrance of the cutter occurring only in the disk or plug cut from the wood.

The center point is made angular in crosssection with the purpose of avoiding splitting of the wood, and preferably the shank, center piece, and cutter forged or formed of one piece of steel, different tools being required for different apertures of different diameter. The cutter maybe readily sharpened by a file or other device applied to its inner face.

In the accompanying drawings, Figure 1 is an elevation; Fig. 2, a longitudinal section of the cutting end of the tool, and Fig.3 a section on line 3 of Fig. 2.

A is the ordinary shank or spindle,the pointed end B of which forms the center piece of the tool and is shown as triangular in crosssection.

0 is the cutter, arranged generally parallel with the axis of the spindle (indicated by the dotted line) and having its end formed as a cutting edge. The outer face 0 is a uniform 5o radial distance from such axis.

The mode of using the toolas, for instance, with any ordinary brace-is obvious. There is no splintering of either the upper or lower surface of the board.

We claim as our invention- I 1. A bit for cutting circular apertures in wood, consisting of a spindle enlarged and bifurcated at its lower end to form a center point and a cutter with a recess between them, one side of the center point being inclined upward to a plane above the upper or inner end of the recess, and merging gradually into the spindle, while the opposite side of the center point forms one Wall of the recess; the outer face of the cutter being a uniform, radial distance from the axis of the spindle from top to bottom, substantially as described.

2. A bit for cutting circular apertures in wood, consisting of a spindle enlarged and bifurcated at its lower end to form a center point, and a cutter, with the center point on one'side of its axis, and the cutter on the opposite side thereof; the outer face of the cutter being of a uniform radial distance from the axis of the spindle from end to end, substantially as described.

A bit for cutting circular apertures in wood, consisting of a spindle enlarged and bifurcated at its lower end to form a center point which is of triangular oross-section, and a cutter which has its end formed with a cut ting edge and an outer face which has a uniform radial distance from the axis of the "8 5 spindle.

4. A bit for cutting circular apertures in wood, consisting of a spindle enlarged and bifurcated at its lower end to form a center point which is triangular in cross-section, is 0 arranged on one side of the axisof the spindle, and one side of which inclines upward to a plane above the upper end of the bifurca tion and merges gradually into the spindle,

[ 2 I testis and a cutter, the outer face of which is of a form radial distance from the spindle, subuniform radial distance from the axis of the stantially as described.

spindle, substantially as described. In testimony whereof We have hereunto sub- 5. A bit for cutting circular apertures in scribed our names;

5 wood, comprising a spindle enlarged and bi- 1 1 furcated at its lower end to form a center gm g BLANDPORD' point arranged wholly on one, side of the axis 7 of the spindle, and a cutter arranged wholly Witnesses: on the opposite side of the said axis, said out- B. O. BLANDFORD,

IO ter having its outer face arranged at a uni- O. G. BROOKE. 

